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Fauna studies in homogeneous forests for commercial plantation purposes are still incipient in the country. These reforestation areas present a few resources necessary to the maintenance of wild life, when compared to the native forests. However, understories present in these homogeneous forests can provide food, shelter, protection and the establishment of a favorable environment to animal movement – thus, optimizing the use of these reforestation areas by the wild fauna. This study took place in the Horto Florestal de Itatinga, an area of mostly eucalypts forests (Eucalyptus ssp) and remaining fragments of native vegetation (semideciduous seasonal forests, savannah and riparian forests), located in Itatinga, state of São Paulo, Brazil. In order to verify if the presence and density of the understories in the eucalypt forests influence in the use of these locations by medium and large-sized mammals, three types of eucalypt environment were compared: a stand of eucalypt without understory, a stand of eucalypt with intermediate understory an a stand of eucalypt with dense understory. Each of these environments received 24 sand plots (tracking traps) containing alimentary baits (banana, bacon and salt), for the observation of the number of animal tracks in each one of them. Registry numbers, frequency of occurrence and the relative abundance of mammals species in each environment, throughout 15 winter days in 2004 (dry season) and 15 summer days in 2005 (wet season), were verified. In the eucalypt environment with dense understory record numbers were higher, and in the eucalypt environment with intermediate understory the richness of species was bigger. The chi-square test (χ) showed significant difference in registry numbers among these three environments, as well as between winter and summer periods. Dietary categories of the mammals observed in these sites were verified, and most of the observed animals belonged to generalist species, and they were not so demanding concerning their habitat. Ten species of medium and large-sized mammals were found in these eucalypts environments all told. The collector’s curve was not stabilized, indicating that there were still other species to be surveyed in these three environments with eucalypts. A qualitative survey of medium and large-sized mammals in the study area in general, was also carried out. For this purpose, direct and indirect records of the mammals, as well as the visualization of these animals, their tracks, feces, hairs, burrows and carcasses were observed. Local people were interviewed and one camera trapping installed. This survey took place throughout 75 days (between July, 2004 e April, 2005). Twenty-seven species of mammals were found in this survey, but the collector’s curve was not stabilized too. Most of the animals observed in this study belonged to generalist species; but at least four species of carnivores (animals are more demanding concerning their habitat) were recorded. This study also accused the presence of eight endangered species in the Horto de Itatinga.

Mamiferos de médio e grande porte em florestas de Eucalyptus spp com diferentes densidades de sub-bosque no município de Itatinga, SP